distro: guile: Switch to 2.0.7.

* distro/packages/guile.scm (guile-2.0/fixed): Alias GUILE-2.0.

distro/packages/guile.scm

@@ -134,15 +134,7 @@ call interface, and powerful string processing.")
 (define-public guile-2.0/fixed
   ;; A package of Guile 2.0 that's rarely changed.  It is the one used
   ;; in the `base' module, and thus changing it entails a full rebuild.
-  (package (inherit guile-2.0)
-    (version "2.0.6")
-    (source (origin
-             (method url-fetch)
-             (uri (string-append "mirror://gnu/guile/guile-" version
-                                 ".tar.xz"))
-             (sha256
-              (base32
-               "000ng5qsq3cl1k35jvzvhwxj92wx4q87745n2fppkd4irh58vv5l"))))))
+  guile-2.0)
 
 
 ;;;